Variable Manipulation and Output by John Coggeshall -- John Coggeshall covers basic variable manipulation and output, including math operators and strings.

Basic PHP Syntax by John Coggeshall -- John Coggeshall covers basic PHP syntax, including variable usage, variable types, and how to print variables to the web browser.

Introduction to Socket Programming with PHP by Daniel Solin -- Daniel Solin uses a game analogy to show how PHP can be used to exchange data between two computers using network sockets.

Introduction to Socket Programming with PHP by Daniel Solin -- Daniel Solin uses a game analogy to show how PHP can be used to exchange data between two computers using network sockets.

An Introduction to Extreme Programming by chromatic -- When you look at it closely, Extreme Programming isn't really as extreme as it is logical. This introduction shows you the tenets of XP and its relationship to open source methods for writing software.

Some Interesting RFC Docs need to read

• 2105 - Cisco Systems' Tag Switching Architecture Overview
  
• 2104 - HMAC: Keyed-hashing for Message Authentication
  
• 2095 - IMAP/POP AUTHorize Extension for Simple Challenge/Response
  
• 2085 - HMAC-MD5 IP Authentication with Replay Prevention
  
• 2083 - PNG (Portable Network Graphics) Spec. version 1.0
  
• 2082 - RIP2 MD5 Authentication
  
• 2080 - RIPng for IPv6
  
• 2069 - An Extension to HTTP: Digest Access Authentication
  
• 2068 - Hypertext Transfer Protocol -- HTTP/1.1
  
• 2058 - Remote Authentication Dial In User Service (RADIUS)
  
• 2046 - Multipurpose Internet Mail Extension (MIME) Part 2: Media Types
  
• 2045 - Multipurpose Internet Mail Extension (MIME) Part 1: Format of Internet Message Bodies
  
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